Electrostatic image developing toner, production method thereof, electrostatic image developer, image forming method and image forming apparatus

Abstract

An electrostatic image developing toner includes a binder resin that includes a polyester carbonate resin or a polyester amide resin, the polyester carbonate resin or the polyester amide resin containing a dodecenylsuccinic acid unit in an mount from about 0.5 mol % to about 30 mol % as a monomer unit; and a colorant.

What is claimed is: 
     
       1. An electrostatic image developing toner comprising:
 a binder resin that comprises at least a polyester carbonate resin, the polyester carbonate resin containing a dodecenylsuccinic acid unit in an mount from about 0.5 mol % to about 30 mol % as a monomer unit; and 
 a colorant. 
 
     
     
       2. The electrostatic image developing toner according to  claim 1 , wherein
 the polyester carbonate resin has a weight average molecular weight of from about 3,000 to about 60,000. 
 
     
     
       3. The electrostatic image developing toner according to  claim 1 , wherein
 the polyester carbonate resin is a crystalline resin having a melting temperature Tm of from about 50° C. to about 120° C. 
 
     
     
       4. The electrostatic image developing toner according to  claim 1 , wherein
 the polyester carbonate resin is a noncrystalline resin having a glass transition temperature Tg of from about 40° C. to about 80° C. 
 
     
     
       5. The electrostatic image developing toner according to  claim 1 , wherein
 the binder resin further comprises an addition polymerization-type resin in an amount of from about 5 wt% to about 50 wt %. 
 
     
     
       6. The electrostatic image developing toner according to  claim 5 , wherein
 the addition polymerization-type resin has a weight average molecular weight of from about 5,000 to about 200,000. 
 
     
     
       7. The electrostatic image developing toner according to  claim 1 , wherein
 the colorant is contained in an amount of from about 0.1 part by weight to about 20 parts by weight per 100 parts by weight of the electrostatic image developing toner. 
 
     
     
       8. The electrostatic image developing toner according to  claim 1 , which has a volume average particle diameter D 50v  of from about 2 μm to about 10 μm. 
     
     
       9. The electrostatic image developing toner according to  claim 1 , which has a number average particle size distribution index GSDp of about 1.40 or less. 
     
     
       10. The electrostatic image developing toner according to  claim 1 , which has a shape factor SF1 of from about 110 to about 145. 
     
     
       11. An electrostatic image developer comprising:
 the electrostatic image developing toner of  claim 1 ; and 
 a carrier. 
 
     
     
       12. An image forming method comprising:
 forming an electrostatic latent image on a surface of a latent image carrier; 
 developing the electrostatic latent image formed on the surface of the latent image carrier with the electrostatic image developer of  claim 11  to form a toner image; 
 transferring the toner image formed on the surface of the latent image carrier onto a surface of a transfer member; and 
 heat-fixing the toner image transferred onto the surface of the transfer member. 
 
     
     
       13. A production method of the electrostatic image developing toner of  claim 1 , the method comprising:
 synthesizing a polyester carbonate resin having, as a monomer unit, from about 0.5 mol % to about 30 mol % of a dodecenylsuccinic acid unit, 
 dispersing a resin containing the polyester carbonate resin in an aqueous medium to obtain a resin particle liquid dispersion, 
 aggregating the resin particles in a liquid dispersion containing at least the resin particle liquid dispersion and a colorant to obtain an aggregate particle, and 
 fusing together the aggregate particles by heating. 
 
     
     
       14. The production method according to  claim 13 , wherein
 the polyester carbonate resin is a polycondensed resin obtained by polycondensation in the presence of a polycondensation catalyst. 
 
     
     
       15. The production method according to  claim 14 , wherein
 the polycondensation catalyst is a sulfur acid. 
 
     
     
       16. The production method according to  claim 14 , wherein
 a used amount of the sulfur acid is from about 0.05 wt % to about 20 wt % based on a total weight of polycondensation components.